Because the reports of molotovs have been a lie. There has been one image of someone trying to light one from the middle of last week. That's it.
This. The end result of them being used would be obvious but we don't see any evidence of them being used with so many cameras around. They may or not be there but that's different from them being thrown. What we do know and see is what the police are doing. They keep saying their being used I think to make it seem like they're being attacked and try to justify their actions but it's such a lie in the face of video of what they themselves are doing.